English Dictionary

sidereal day

noun

(astronomy) One day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox (about 23 hours, 56 minutes, 4 seconds).

The sidereal day is the time it takes for a star to return to the same position in the sky.

意味（1）

(astronomy) One day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox (about 23 hours, 56 minutes, 4 seconds).

意味（2）

(astronomy) The rotational period of Earth; the time in which Earth rotates around its axis 360 degrees.